排序方式: 共有36条查询结果,搜索用时 31 毫秒
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Dr. Hong Shang Yu Gu Prof. Yingbin Wang Dr. Zicheng Zuo 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(24):5434-5440
Nonuniform nucleation is one of the major reasons for the dendric growth of metallic lithium, which leads to intractable problems in the efficiency, reversibility, and safety in Li-based batteries. To improve the deposition of metallic Li on Cu substrates, herein, a freestanding current collector (NGDY@CuNW) is formed by coating pyridinic nitrogen-doped graphdiyne (NGDY) nanofilms on 3D Cu nanowires (CuNWs). Theoretical predictions reveal that the introduction of nitrogen atoms in the 2D GDY can enhance the binding energy between the Li atom and GDY, therefore improving the lithiophilicity on the surface for uniform lithium nucleation and deposition. Accordingly, the deposited metallic Li on the NGDY@CuNW electrode exhibits a dendrite-free morphology, resulting in significant improvements in terms of the reversibility with a high coulombic efficiency (CE) and a long lifespan at high current density. Our research provides an efficient method to control the surface property of Cu, which also will be instructive for other metal batteries. 相似文献
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Prof. Yongjun Li Jingyi He Han Shen 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(54):12310-12321
Graphdiyne (GDY) exhibits unique characteristics of a highly conjugated π system, evenly distributed nanopores, and a direct band gap. This has encouraged multidisciplinary research groups to investigate its application in energy conversion and storage, catalysts, electronic devices, sensing, and separation. Herein, the achievements of synthetic strategies for preparing small-molecule diyne structures (GDY substructure), 1D nanoribbons, and 2D GDY are presented. These studies may help future investigations into the basic structure-related properties of GDY and synthetic methodology for the future developments of GDY-related 2D carbon materials. 相似文献
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Tianyu Yuan Shijie Xiong Xinghai Shen 《Angewandte Chemie (International ed. in English)》2020,59(40):17719-17725
The coordination of actinides and lanthanides, as well as strontium and cesium with graphdiyne (GDY) was studied experimentally and theoretically. On the basis of experimental results and/or theoretical calculations, it was suggested that Th4+, Pu4+, Am3+, Cm3+, and Cs+ exist in single‐ion states on the special triangular structure of GDY with various coordination patterns, wherein GDY itself is deformed in different ways. Both experiment and theoretical calculations strongly indicate that UO22+, La3+, Eu3+, Tm3+ and Sr2+ are not adsorbed by GDY at all. The distinguished adsorption behaviors of GDY afford an important strategy for highly selective separation of actinides and lanthanides, Th4+ and UO22+, and Cs+ and Sr2+, in the nuclear fuel cycle. Also, the present work sheds light on an approach to explore the unique functions and physicochemical properties of actinides in single‐ion states. 相似文献
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Hailong Yan Shuyue Guo Dr. Fei Wu Prof. Ping Yu Prof. Huibiao Liu Prof. Yuliang Li Prof. Lanqun Mao 《Angewandte Chemie (International ed. in English)》2018,57(15):3922-3926
Graphdiyne oxide (GDO), the oxidized form of graphdiyne (GDY), exhibits an ultrafast humidity response with an unprecedented response speed (ca. 7 ms), which is three times faster than that of graphene oxide (GO) with the same thickness and O/C ratio. The ultrafast humidity response of GDO is considered to benefit from the unique carbon hybridization of GDO, which contains acetylenic bonds that are more electron‐withdrawing than ethylenic bonds in GO, consequently giving rise to a faster binding rate with water. This distinctive structure‐based property enables the fabrication of a novel GDO‐based humidity sensor with an ultrafast response speed and good selectivity against other kinds of gas molecules as well as high sensitivity. These properties allow the sensor to accurately monitor the respiration rate change of human and hypoxic rats. 相似文献
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石墨炔作为一种新的稳定的碳同素异形体,由于其独特的结构和性能,预计可广泛地应用于纳米材料及器件中.在本文中,我们采用B3LYP/6-31+G*理论研究了其结构参数、Wiberg键级以及芳香性.计算结果表明,所有的碳原子的p-电子参与形成了非定域的π-键,使得所有C—C键长平均化.苯环的核独立化学位移比乙炔形成的不等边六边形的更负,表明苯环的芳香性更强.该化合物的拓扑性质与Wiberg键级的计算结果也一致.另外,该化合物的LUMO(0.27 eV)带宽大于其HOMO(0.24 eV)的带宽,表明它应该是n-型材料.当采用对称性破缺方法重新对该化合物优化后,计算结果显示该化合物含有3.6个未成对电子,并具有一定的化学反应活性. 相似文献
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Danbo Wang Lin Zhang Siqi Chen Dr. Qingyan Pan Zefang Yu Xu Jia Dr. Lixia He Dr. Chaoqin Li Prof. Yingjie Zhao 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(34):e202200442
We report a facile strategy to prepare a large amount of ultrathin graphdiyne (GDY) with good crystallinity in the mixture of oil–water systems. By simply mixing the solution of GDY monomer in CHCl3 and the copper acetate solution as a catalyst in water and stirring at room temperature, ultrathin GDY films with a thickness of ∼4 nm were obtained in a yield of 95 %. This work provides a feasible path for the substantial preparation of GDY films and may pave the way to the development of substantial preparation of the GDY materials. 相似文献
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Yan Fang Yurui Xue Yongjun Li Huidi Yu Lan Hui Yuxin Liu Chengyu Xing Chao Zhang Danyan Zhang Zhongqiang Wang Xi Chen Yang Gao Bolong Huang Yuliang Li 《Angewandte Chemie (International ed. in English)》2020,59(31):13021-13027
A freestanding 3D graphdiyne–cobalt nitride (GDY/Co2N) with a highly active and selective interface is fabricated for the electrochemical nitrogen reduction reaction (ECNRR). Density function theory calculations reveal that the interface‐bonded GDY contributes an unique p‐electronic character to optimally modify the Co‐N compound surface bonding, which generates as‐observed superior electronic activity for NRR catalysis at the interface region. Experimentally, at atmospheric pressure and room temperature, the electrocatalyst creates a new record of ammonia yield rate (Y ) and Faradaic efficiency (FE) of 219.72 μg h?1 mgcat.?1 and 58.60 %, respectively, in acidic conditions, higher than reported electrocatalysts. Such a catalyst is promising to generate new concepts, new knowledge, and new phenomena in electrocatalytic research, driving rapid development in the field of electrocatalysis. 相似文献